Flow Tests Tab

The Hydrants Module can keep track of flow tests for each Hydrant in the system. The following is details around each item in the flow test tab that is found within each hydrant.

Add flow tests for the hydrant by clicking Add Flow Test.

Fill in fields shown below:

Flow Test Data

  • Test Date/Time: Date and time of hydrant test. Use the Now hyperlink to add today’s date/time into the field
  • Tested By: Start typing in a name and then choose a name, or use the Me hyperlink to quickly put in your name. 

Test Hydrant: For the Hydrant Being Tested

  • Static Pressure (s): Pressure reading before water flows (PSI-pounds per square inch - lb/in²).
  • Residual Pressure (r): Pressure reading while water is flowing (PSI), from an outlet other than the flow outlet.
  • Desired Pressure (d): The standard pressure applied to all hydrant tests (PSI). Generally, this value is 20 PSI.
  • Total Flow measured during test (F):  The total flow in gallons-per-minute for the test. More than one flow hydrant may be needed to achieve an accurate Volume calculation at the desire pressure.
  • Volume at Desired Pressure (Calculated) (V): Final hydrant flow. Units are gallons per minute. The calculation is based off the following equation:

Flow Hydrants

  • Downstream Hydrant Data (Enter info for the nearest hydrant downstream from the hydrant being tested)
  • Inside diameter of flow port in inches (d): Exit port’s inside diameter.
  • Friction Coefficient (c):  Since hydrant nozzles typically don’t produce perfect discharge columns, this field serves as a correction factor used to compensate for errant pitot readings. Hydrant manufacturers should be able to provide coefficients for their products. Standard coefficients 0.9, 0.8, 0.7 can be selected. If a flow tube or “stream straightener” is used on the hydrant, the coefficient would be 1.
  • Pitot Pressure (p): Reading taken by a pitot gauge inserted into the flowing outlet, at a distance away from the lip of the outlet of about half the nozzle’s diameter.
  • Flow (Calculated) (Q): Calculation based off inside diameter, pitot pressure and friction coefficient. Units are in gallons per minute. The calculation is based off the following equation:
  • Pass / Fail: Select PASS or FAIL for outcome of the test.
  • Remarks: Use this space for additional information not addressed in the above fields. Click Save when all fields have been filled in as needed.

Additional downstream hydrants may be added as needed by clicking the “Add Another Flow Hydrant” button. If needed, any of the flow hydrants can be deleted by clicking on the trash can icon on the right side.

Files/Images may be added in the Files/Images tab for the flow tests. Click the Upload Files button.

The settings are found within the Hydrants Module.
1. Click the Hydrants tab.
2. Click on any Hydrant in the Grid View.
3. Click on Flow Tests Tab.


  • If you are only testing a single hydrant, for instance, an end hydrant, gather all of the Test Hydrant and Downstream Hydrant data from the single hydrant you are testing. Enter the numbers from that single hydrant into the Test and Downstream fields and think of them together as two aspects of the same hydrant.

  • The Hydrant test data input fields and calculations are modeled after National Fire Protection Association Recommended Practice for Fire Flow Testing and Marking of Hydrants Standard 291 (2016 Edition). If your department uses a different testing methodology, you can disregard the Calculation buttons for each hydrant and manually enter your own results for both the Test and Downstream hydrants. For more general information on testing and other hydrant-related issues, we recommend checking out some of the articles at FireHydrant.org: http://www.firehydrant.org. Click on the FHO Search Engine link and search for the phrase flow test.

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